As Figure 1 showed, cell viability was not influenced within 10 hours. Incubated with 12 and 14 hours, Caco-2 cell viability showed significant decrease. As a result, we co-cultured Caco-2 cells and Lactobacillus plantarum for 10 hours in the following experiments. Figure 1 Approximately 1 × 10 5 cells

were plated onto 96-well plates for 24 h, followed by treatment with live/ heat-killed L. plantarum MYL26 ( L. plantarum MYL31/ MYL68 data not shown) and different cellular parts for 6, 8, 10, 12 and 14 hours. Symbol * represents P-value smaller than 0.05 analyzed by t-test in comparison with negative selleck chemicals llc control group. (n = 3). Negative control: Caco-2 Erismodegib price cells were not treated with probiotics. Lactobacillus plantarum attenuates LPS-induced cytokine secretion Three different strains of Lactobacillus plantarum (MYL26, MYL31 and MYL68) were tested and the most potent strain, in terms of refractoriness to subsequent LPS stimulation, was selected. As shown in Figure 2, L. plantarum MYL26 attenuated TNF-α, IL-6, IL-8, and IL-12 production more effectively than those of other strains. Figure 2 Caco-2 cells (10 6 cells/mL) were treated with live L. plantarum MYL26/ MYL31/ MYL68 CP-690550 nmr (10 7   cfu/mL) at 37°C for 10 hours, followed by 1 μg/mL LPS challenge. Negative control: Caco-2 cells

were not treated with LPS and probiotics. (Cytokine secretion baseline). Lactobacillus plantarum MYL26 attenuates downstream signal transduction of TLR4-NFκB pathway The results of RT-qPCR (Figure 3) indicated that there are no significant differences in the expressions of TLR4, MyD88 and IRAK1 in comparison with those of LPS treatment group. The expressions of TRAF6, TAK1 and IKKβ decreased more significantly

under L. plantarum MYL26 treatment than those under LPS treatment alone. Figure 3 Caco-2 cells (10 6 cells/mL) were treated with live L. plantarum MYL26 (10 7   cfu/mL) at 37°C for 10 hours followed by 1 μg/mL LPS challenge. Gene expressions Reverse transcriptase were assayed by RT-qPCT normalized by GAPDH. Symbol * represents P-value smaller than 0.05 analyzed by t-test in comparison with negative control group. (n = 3). Negative control: Caco-2 cells were challenged by LPS without pretreatment with probiotics. Lactobacillus plantarum MYL26 pretreatment elicits anti-inflammatory properties by enhancing the expressions of TOLLIP, SOCS1 and SOCS Since TRAF6, TAK1 and IKKβ were down-regulated, five potential negative regulator gene expressions were examined. As shown in Figure 4, there were no considerable differences in the expressions of IRAK3 and SHIP1 while the expressions of TOLLIP, SOCS1 and SOCS3 were higher than those in the control groups. Figure 4 Caco-2 cells (10 6 cells/mL) were treated with live L. plantarum MYL26 (10 7   cfu/mL) at 37°C for 10 hours.